Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2565acb1dc7df47…

MALICIOUS

PDF

88.6 KB Created: 2021-07-04 17:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 888619bfa680a72e154f41ff90fdaffb SHA-1: db1bf224c9113494f4720b85119ec3ff3af6c37f SHA-256: c2565acb1dc7df4765690163e9d04ce43fd9aa155f033651e0cb7194ae4a07bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links, combined with the 'Fake invoice / payment lure' heuristic, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=how+to+create+a+pdf+file+in+microsoft+word PDF link annotation
    • http://adaviestransportltd.com/userfiles/file/rekixu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r75ml49cq004padp6e5cbj2v4b/tetegonasosikifusuluninet.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/61010558687.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b3c099667a3c988d6bebfe8548bbbdb9/85316602430.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nadid.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7085e2deb1a71eef386c16c5b2b94a87/kopubamatokezufo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5b0145a0b1f0b18c6b40019fa10bbdd0/40633955420.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/55641735157.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/95fc1bc0066294e73b350bd5f12388db/jibevagazoxe.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nokutugodunivupokosolufi.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/76087693411.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/bedukoliribijegudo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/36905975274.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/midazepini.pdfIn PDF document text
    • https://eternalbliss.net/file/pinaninoxemeno.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1328e87bc7fc1b9e53eac6f6c7ed180d/30315938895.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c9e498dd---nurusokedifaguri.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/91272211676.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859f953abc9---47272798924.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b351d88a4ffd1d181b0658ce3f2ae506/86892677506.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/87024796335.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e60c9368---85504028211.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0a7becc7f2613b5a17870f3f379ac14c/mopizesubime.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7ba1e7312891d4207eb9a73f75c2b994/70970633544.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 10860 bytes
SHA-256: f446740353e32de6dab4b17d681d5492150a4105825c51605859ae354142f363
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 17448 bytes
SHA-256: d43e3d7c0de24556f06004ab45d97fc63d548cef486c6d87ea2ebbe349484262